2 * Read-Copy Update mechanism for mutual exclusion (tree-based version)
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 * Copyright IBM Corporation, 2008
20 * Author: Dipankar Sarma <dipankar@in.ibm.com>
21 * Paul E. McKenney <paulmck@linux.vnet.ibm.com> Hierarchical algorithm
23 * Based on the original work by Paul McKenney <paulmck@us.ibm.com>
24 * and inputs from Rusty Russell, Andrea Arcangeli and Andi Kleen.
26 * For detailed explanation of Read-Copy Update mechanism see -
30 #ifndef __LINUX_RCUTREE_H
31 #define __LINUX_RCUTREE_H
33 struct notifier_block
;
35 extern void rcu_sched_qs(int cpu
);
36 extern void rcu_bh_qs(int cpu
);
37 extern int rcu_needs_cpu(int cpu
);
38 extern void rcu_scheduler_starting(void);
39 extern int rcu_expedited_torture_stats(char *page
);
41 #ifdef CONFIG_TREE_PREEMPT_RCU
43 extern void __rcu_read_lock(void);
44 extern void __rcu_read_unlock(void);
45 extern void synchronize_rcu(void);
46 extern void exit_rcu(void);
49 * Defined as macro as it is a very low level header
50 * included from areas that don't even know about current
52 #define rcu_preempt_depth() (current->rcu_read_lock_nesting)
54 #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
56 static inline void __rcu_read_lock(void)
61 static inline void __rcu_read_unlock(void)
66 #define synchronize_rcu synchronize_sched
68 static inline void exit_rcu(void)
72 static inline int rcu_preempt_depth(void)
77 #endif /* #else #ifdef CONFIG_TREE_PREEMPT_RCU */
79 static inline void __rcu_read_lock_bh(void)
83 static inline void __rcu_read_unlock_bh(void)
88 extern void call_rcu_sched(struct rcu_head
*head
,
89 void (*func
)(struct rcu_head
*rcu
));
90 extern void synchronize_rcu_expedited(void);
92 static inline void synchronize_rcu_bh_expedited(void)
94 synchronize_sched_expedited();
97 extern void rcu_check_callbacks(int cpu
, int user
);
99 extern long rcu_batches_completed(void);
100 extern long rcu_batches_completed_bh(void);
101 extern long rcu_batches_completed_sched(void);
104 void rcu_enter_nohz(void);
105 void rcu_exit_nohz(void);
106 #else /* CONFIG_NO_HZ */
107 static inline void rcu_enter_nohz(void)
110 static inline void rcu_exit_nohz(void)
113 #endif /* CONFIG_NO_HZ */
115 /* A context switch is a grace period for RCU-sched and RCU-bh. */
116 static inline int rcu_blocking_is_gp(void)
118 return num_online_cpus() == 1;
121 #endif /* __LINUX_RCUTREE_H */
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